Abstract：Single Electron Transfer-Degenerative Chain Transfer (SET-DT) polymerization is a living radical polymerization (LRP) process exhibited wide monomer applicability under mild reaction conditions. In this paper, SET-DT LRP of butyl acrylate(BA) catalyzed by Na2S2O4 and initiated by CHI3 in aqueous phase were carried out in a miniemulsion way. The influences of polymerization temperature, initiator/catalyst concentrations, catalyst adding policy and emulsifier concentration on the polymerization kinetics, number average molecular weight (Mn) and polydispersity index (PDI) of poly(butyl acrylate) were investigated. It was found that BA SET-DT miniemulsion polymerization exhibited much greater polymerization rate than that of suspension polymerization at the same polymerization temperature and catalyst/initiator concentrations. BA can be rapidly polymerized at lower temperature (below 30℃), and lower initiator/catalyst concentrations (the initial molar ratio of BA, Na2S2O4 to CHI3 1 600:1:8). The polymerization rates were increased by adding Na2S2O4 continuously, reducing the monomer droplet (latex particle) size and increasing the concentration of sodium dodecyl sulfate emulsifier during the polymerization. Poly(butyl acrylate) prepared at lower initiator concentration and with continuous addition of catalyst exhibited grater Mn and lower PDI.
Wang Zifan,Jia Rui,Bao Yongzhong. Miniemulsion Single Electron Transfer-Degenerative Chain Transfer Polymerization of Butyl Acrylate[J]. 化学反应工程与工艺, 2016, 32(1): 60-65.
